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If you have too many open, we'd crash from exhausing all JNI references.
Shouldn't be an issue in practice but saw it from 726426
BUG=726426

Change-Id: I30ac884275154068a0232b62dae7b22e00d9e5e3
Reviewed-on: https://chromium-review.googlesource.com/893532Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Yaron Friedman <yfriedman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533010}